Synonyms Examples Word Origin See more synonyms on Thesaurus.com of, relating to, or causing death; deadly; fatal: a lethal weapon; a lethal dose. made or carried out to cause death: a lethal chamber; a lethal attack. causing great harm or destruction: The disclosures were lethal to his candidacy. Origin of lethal 1575–85;
) death +
-ālis -al 1
; spelling (hence pronunciation) with
by association with
Related forms le·thal·i·ty, le·thal·ness, noun le·thal·ly, adverb hy·per·le·thal, adjective non·le·thal, adjective non·le·thal·ly, adverb sem·i·le·thal, adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for lethally British Dictionary definitions for lethally able to cause or causing death of or suggestive of death Derived Forms lethality ( liːˈθælɪtɪ), noun lethally, adverb Word Origin
C16: from Latin
lēthālis, from lētum death
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for lethally lethal adj.
1580s, from Late Latin
lethalis, alteration of Latin letalis "deadly, fatal," from letum "death," of uncertain origin. Form altered in Late Latin by association with lethe hydor "water of oblivion" in Hades in Greek mythology, from Greek lethe "forgetfulness."
Online Etymology Dictionary, © 2010 Douglas Harper
lethal ([object Object]) Capable of causing death. Of, relating to, or causing death.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.